When Yoshitaka Shindo was a boy, he did not hear much from his family about his grandfather, Tadamichi Kuribayashi, commander of the Japanese troops who fought and died in the bloody Battle of Iwojima.

The battle, in which nearly 7,000 U.S. Marines and Navy sailors and almost 22,000 Japanese troops died, was etched in America’s memory by an Associated Press photo of six servicemen raising the Stars and Stripes atop the small volcanic island’s Mount Suribachi.

For many in Japan, however, it was long a tragic defeat best forgotten. “Human beings don’t want to talk about what is most painful,” Shindo, a conservative ruling party lawmaker and former member of Prime Minister Shinzo Abe’s Cabinet, said in an interview. “As a child, I was told that my grandfather worked diligently for the sake of the country and that he was a very gentle person. But as for details such as what happened when, neither my grandmother or mother really spoke about that.”

Defense Minister Gen Nakatani and health minister Yasuhisa Shiozaki attended a memorial service with U.S. representatives Saturday to mark the 70th anniversary of the epic 36-day battle.

More ordinary Japanese are now aware of the battle, in part because of Clint Eastwood’s 2006 film “Letters from Iwo Jima,” inspired by letters from Kuribayashi to his family on the eve of the battle. Just 1,083 Japanese troops escaped death.

But the years of silence have left a gap that makes it harder to pass on wartime experiences to younger Japanese.

“My grandfather didn’t really like to speak about the war. At night, he would moan in his sleep. He would scream sometimes and I assumed it was because of the war,” said Atsushi Hirano, 22, who has traveled to 11 battlefields, including Iwojima, as a member of a group that collects the bones of fallen soldiers.

“But I always thought I couldn’t ask about it and then he died six years ago,” said Hirano.

The tiny tear-shaped island of Iwojima, now called Iwoto, 1,000 km south of Tokyo, was the first scrap of Japan’s home soil to be invaded in World War II.

Kuribayashi, who studied at Harvard and served as a military attache in the United States, had little hope of victory at a time when many Japanese leaders knew the war had been lost. “The battle looms and except when I am tired and sleep, all I think of is the fierce fight, an honorable death, and what will happen to you and the children after that,” wrote the father of three.

But aiming to inflict as much damage as possible on the U.S. forces, Kurbayashi honeycombed the island with tunnels from which Japanese troops could only be dislodged at great cost.

Shindo said his grandfather was believed to have been struck down by a bullet after he removed his officer’s insignia and joined his troops in an attack on U.S. forces.

Kuribayashi’s bones have never been recovered — nor have the remains of more than half of the Japanese soldiers who died.

“They hid themselves on that fortress of an island and fought on alone to prolong the battle,” Shindo said. “They think they are still fighting, so I want to bring them home as soon as possible.”

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